Timeline from table in Sheets with five columns

[Ingeborg Altern Vedal]

I'm trying to create a timeline chart of world leaders based on a table in Google sheets. I would like to give one of the columns the role 'tooltip'. How may I do that

[Ingeborg Altern Vedal]

I was to tired to explain yesterday, I'll try now:
What I want is similar to this:
https://developers.google.com/chart/interactive/docs/gallery/timeline

But instead of presidents, vice-presidents etc I will have different countries, so that each country get it's own bar. I could make a table with the four columns: country, president, start date, end date. But I need to color-code based on what kind of government (dictatorship, democracy etc). So I thought I put the government in the second column and the president's name in a tooltip-column.

I just can't figure out how to tell in the script that I have a tooltip-column in my sheet-table and which one it is.

[Ingeborg Altern Vedal]

I've also been looking for the following solutions, but neither seem possible:

1. Make a timeline based two resource-columns:
1. Color based on a government-column
2. Label based on a president-column
2. Turn off the link resource-color and define the colors by options-variable
3. Make a color-column with hexa-values

I appriciate any suggestions that may help me! Maybe Google might add any of these features to a very nice tool that just need a little improvement?

[Ingeborg Altern Vedal]

An example:

http://fugasker.no/kake.html